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cfnAELEs A. 'HAEPEE AND ISAAC A. CRANE, 0E EAEWAY, A1\IEW4 JERSEY, lLetters .Patent'Na '71, 481rdatecl Novem'bcr26,1867. i

DETAGHABLE OVEN DRUM.

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[To ALL wHoM 1T MAY ooNcERN:

` Be it known that we, G nAELEs A. HARPER and IsAAo A. CRANE, ofahway,in the county ot Union, and State of New Jersey, have invented a new anduseful Improvement in Detachable Ovens and Heating- Drains for useinconnection with'any kind of stoveor heater; and we do hereby declarethat the following isa full, clear, and exact description of thesame,referencebeing had to the annexed drawings, making part of thisspeciiication, in whichi 1 i Figure 1 is a perspective view. Figure 2 isa vertical longitudinal section. Figure 3 is a verticaltransverse-section. In all .the figures the sameletters are employed inthe designation of the same parts. A This drum and oven is intended tobe attached tto the pipe of any form of stove o r heater, and ourimprov'e-i ment consists in the mode of obtaining the di'usion of theheat over the surface of the platesformingtbe inner" oven; alsovin'themode of obtaining atmospheric circulation throughtheoven or drum.` i

Thefollowing description will enable those who are skilled in the. artto make and apply our `imprpved oven and drum. i

A is the external ease oi the drum, attached to the pipes B and C.Within this case is a smalleroven, D, i formed by a bottom, top, twosides, and an end plate, around, and in contact with all of which,'.tl1eheat passing into thepipe is brought as it passes through the drum. Aplate, D', is placed over` the inlet-pipe Bto prevent ltoo great heat atthc point when the up 'rising` current would otherwise strike'againstthe bottom plate of the r 'oven.' In order to secure a more perfectdiiusion of the circulation, flanges E E areextendd'froln Vthe top` of``the sides totheexternal casa-which, preventing the draught from passingdirectly upon theitop plate, forces4 4 it to pass across the end plateand thence overfthe top plate. A dat pipe, Gr, is constructed under thetop plate of the exterior casing, extending over the top plate of theoven', from its rear end nearly to the front. The space between Atherear of this pipe, wherejit is left openr'above the back iiue, Vmay beclosed by a damper, `H, l f which, actuated by a rod, H', may he usedeither to `close that opening, andthus force the circulation to passover the top of the oven to enter the pipe Gr, or to open it, and thusleave a free course for the draughtdi-rectly* into the pipe C. The doorI closes the front of the oven. v.It is formed-with two rowsofholos,covered by slides K and K', with corresponding holes for the purpose ofmaking an atmospheric circulation' through the oven, i passing in at thelower openings K, and forced to traverse twice along thelength'of theoven by a centralplate,

L, extending across the oven from the door nearly to the back 'of theoven, leaving a space, L,-and then passing" `A out at the upper openingsK. These openings areJ especially designed for usewhen the' oven is notin use@ except as a drum. v A A A i By this means we greatly increasethe heating-surface of the drum, and also provide a means for regulatingthe heat in the oven when usedfor bakingi by the introduction of anatmospheric current `intothe oven by slightly opening the spaces and K.Y

vWhat n'e'claim as our invention, anddesire to secure by IiettersPatent, is- A 1. In' combination with the external ease A and internaloven D,.the ilanges E, llocated as described, pipe G and damper H, forthe purpose of eiiecting distributori of the heat, substantially as setforth.

2. In combination with the external casingA and oven D, we claim thedoor I, with the lower and upper series of openings at K and K', and theplate .L so placed as to leave the sppce L' at'the back 0f the oven,sub-y stantially as and for the purpose set forth. A 3. In combinationwith the external case A, oven D, and pipe B, we claim the plate D',arranged to operate substantially as and for the purpose set forth. Y i

In testimony whereof we have signed our names to this specification inthe presence of two subscribing Witnesses: R. M. EnM'oNns, JOSEPHCoNKLIN.

